AQA AS UNIT 2 FULL NOTES

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AS Biology Unit 2 page 1


AQA AS Biology Unit 2
Contents
Specification 2 Gas exchange 4 The Circulatory System 11 Haemoglobin 18 Plant Cells 21 Gas
exchange in plants 24 Water Transport in Plants 26 Biodiversity 33 Intraspecific Diversity 34
Interspecific Diversity 39 DNA 43 DNA replication 46 Gene…

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AS Biology Unit 2 page 2


Biology Unit 2 Specification
Physiology Surface Area to Volume Ratio The relationship between the size of an organism or structure and surface area to
volume ratio. Explain the significance of the relationship between size and surface area to volume ratio for the exchange of…

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from the formula d = N (N ­ 1) / n (n ­ 1) where N = total number of organisms of all species and n = total number of
organisms of each species. Calculate the index of diversity from suitable data.
Loss of Species Diversity The influence of deforestation…

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AS Biology Unit 2 page 3
Genetics
different combinations of maternal and paternal DNA
Structure
chromosomes. The doublehelix structure of DNA
enabling it to act as a stable informationcarrying molecule, in terms of the components of DNA nucleotides: deoxyribose,
phosphate and the bases adenine, cytosine, guanine and thymine two sugarphosphate…

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